Update Cosmic Explorer interferometers

• update the Cosmic Explorer noise budgets to those shown in arXiv:2012.03608
• remove CE2 and add CE2silica and CE2silicon
• add intermediate platform motion which is needed for CE1

gwinc/ifo/CE1/__init__.py

@@ -69,7 +69,6 @@ class Substrate(nb.Budget):
     style = dict(
         label='Substrate Thermal',
         color='#fb7d07',
-        linestyle='--',
     )
 
     noises = [
@@ -78,6 +77,9 @@ class Substrate(nb.Budget):
     ]
 
 
+ExcessGas.style['linestyle'] = '-'
+
+
 class CE1(nb.Budget):
 
     name = 'Cosmic Explorer 1'